1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.struts;
24  
25  import com.liferay.portal.kernel.servlet.HttpHeaders;
26  import com.liferay.portal.kernel.util.ContentTypes;
27  import com.liferay.portal.util.PortalUtil;
28  
29  import java.io.PrintWriter;
30  
31  import javax.servlet.http.HttpServletRequest;
32  import javax.servlet.http.HttpServletResponse;
33  
34  import org.apache.struts.action.Action;
35  import org.apache.struts.action.ActionForm;
36  import org.apache.struts.action.ActionForward;
37  import org.apache.struts.action.ActionMapping;
38  
39  /**
40   * <a href="AJAXAction.java.html"><b><i>View Source</i></b></a>
41   *
42   * @author Brian Wing Shun Chan
43   */
44  public abstract class AJAXAction extends Action {
45  
46      public ActionForward execute(
47              ActionMapping mapping, ActionForm form, HttpServletRequest request,
48              HttpServletResponse response)
49          throws Exception {
50  
51          String text = null;
52  
53          try {
54              text = getText(mapping, form, request, response);
55          }
56          catch (Exception e) {
57              PortalUtil.sendError(
58                  HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e, request,
59                  response);
60  
61              return null;
62          }
63  
64          response.setContentType(ContentTypes.TEXT_PLAIN_UTF8);
65          response.setHeader(HttpHeaders.CACHE_CONTROL, "no-cache");
66  
67          PrintWriter pw = response.getWriter();
68  
69          pw.write(text);
70  
71          pw.close();
72  
73          return null;
74      }
75  
76      public abstract String getText(
77              ActionMapping mapping, ActionForm form, HttpServletRequest request,
78              HttpServletResponse response)
79          throws Exception;
80  
81  }